PROBLEM TO BE SOLVED: To provide mesoporous silica capable of obtaining high sustained-release properties, useful for a carrier of DDS (drug delivery system).SOLUTION: Mesoporous silica is characterized in that micropore distribution measured by a non-localized density functional theory is bimodal distribution having respective local maximum values within a range of 2-5 nm micropore diameter and within a range of 23-32 nm micropore diameter, and the total volume of pores in the range of 2-5 nm micropore diameter and pores in the range of 23-32 nm micropore diameter is 40% or more of total volume of all pores.COPYRIGHT: (C)2014,JPO&INPIT【課題】DDSのキャリアに有用な、高い徐放性が得られるメソポーラスシリカの提供。【解決手段】非局在化密度汎関数法によって求められる細孔分布が、細孔径が2~5nmの範囲内と、細孔径が23~32nmの範囲内とにそれぞれ極大値を有する2峰性分布であり、かつ、細孔径が2~5nmの範囲内にある細孔と細孔径が23~32nmの範囲内にある細孔の容積の合計が、全細孔の容積総計の40%以上であることを特徴とするメソポーラスシリカ。【選択図】図4
